Coal is a combustible sedimentary rock that occurs in rock strata in layers or veins known as coal beds. Coal is composed primarily of carbon along with other elements, such as hydrogen, oxygen and nitrogen. Coal is a fossil fuel that forms when dead plants matter is converted into peat. It involves biological and geological processes which take place over millions of more

Coal is a combustible sedimentary rock that occurs in rock strata in layers or veins known as coal beds. Coal is composed primarily of carbon along with other elements, such as hydrogen, oxygen and nitrogen. Coal is a fossil fuel that forms when dead plants matter is converted into peat. It involves biological and geological processes which take place over millions of years. Coal is traditionally extracted from the ground through coal mining. The largest coal mining industries in the world are China, USA, India and Australia.